package ch.deletescape.lawnchair.util;

/*
  Copyright (C) 2015 The Android Open Source Project

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Configuration;
import android.util.Log;

import ch.deletescape.lawnchair.Utilities;

/**
 * {@link BroadcastReceiver} which watches configuration changes and
 * restarts the process in case changes which affect the device profile occur.
 */
public class ConfigMonitor extends BroadcastReceiver {

    private final Context mContext;
    private final float mFontScale;
    private final int mDensity;

    public ConfigMonitor(Context context) {
        mContext = context;

        Configuration config = context.getResources().getConfiguration();
        mFontScale = config.fontScale;
        mDensity = getDensity(config);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Configuration config = context.getResources().getConfiguration();
        if (mFontScale != config.fontScale || mDensity != getDensity(config)) {
            Log.d("ConfigMonitor", "Configuration changed, restarting launcher");
            mContext.unregisterReceiver(this);
            Utilities.restartLauncher(context);
        }
    }

    public void register() {
        mContext.registerReceiver(this, new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
    }

    private static int getDensity(Configuration config) {
        return config.densityDpi;
    }
}
